peptides

 Peptides are small chains of amino acids that can act as messengers in the body. They help cells and body systems communicate and are involved in many everyday functions, including energy, metabolism, appetite, sleep, cognition, immune function, hormone signaling, tissue repair and recovery.

Some peptides are naturally produced by the body, while others used in research are synthetic or modified versions designed to interact with specific biological pathways.

The AO Scan peptide library gives us another way to explore these connections through frequency-based wellness support while learning about the body systems and pathways associated with each peptide.

Awareness Brings Change.

The more we understand how the body's systems communicate, the easier it becomes to see how everything connects.

The brain depends on communication between neurons and other cells to support attention, learning, memory, emotional regulation, stress response, and neuroplasticity. Neuroplasticity is the brain's ability to adapt and form or reorganize connections in response to learning and experience.

Semax — studied in connection with attention, learning, memory, neuroprotection, and neurotrophic signaling.

N-Acetyl-Semax — a modified Semax-related peptide associated with neurological and cognitive research.

Selank — studied in connection with stress and anxiety-related signaling, cognition, and nervous-system function.

N-Acetyl-Selank — a modified Selank-related peptide associated with stress-response and cognitive research.

PE-22-28 — an experimental peptide investigated in neurological research, including neuroplasticity-related pathways.

Human brain-imaging research has examined Semax and Selank and their relationship with functional connectivity between areas of the brain involved in emotional processing and executive functions. That makes this a useful single research source for this overall category.

The heart works continuously to pump blood, deliver oxygen and nutrients, and maintain circulation throughout the body. Healthy cardiovascular function also depends on the structure of the heart muscle, flexible blood vessels, and the body's ability to respond to physical stress and tissue injury.

Changes in cardiac tissue, blood-vessel function, inflammation, and fibrosis can affect how efficiently the heart contracts and circulates blood.

B7-33 is a synthetic peptide derived from human relaxin-2. It interacts with the RXFP1 receptor, which is involved in cardiovascular and tissue-remodeling pathways.

Researchers have studied B7-33 in connection with cardiac fibrosis, heart-muscle remodeling, inflammation, blood-vessel function, and cardiac protection. 

Preclinical cardiovascular research has found that B7-33 can influence biological processes involved in collagen accumulation, fibrosis, cardiac remodeling, inflammation, and vascular function.

In experimental models of cardiomyopathy and heart injury, researchers observed reductions in left-ventricular fibrosis and inflammation along with changes in cardiac and vascular function. These findings are promising but remain primarily preclinical, so additional human research is needed. 

Blood sugar, appetite, and body weight are connected through communication between the digestive system, pancreas, brain, and hormones.

After we eat, the body releases signals that help regulate blood glucose, insulin, glucagon, hunger, fullness, digestion, and food intake. These signals help the body respond to incoming nutrients while maintaining energy balance.

One important part of this communication system is GLP-1 (glucagon-like peptide-1), a naturally occurring peptide hormone released primarily from cells in the intestine after eating. GLP-1 helps connect what is happening in the digestive tract with the pancreas and brain. 

Semaglutide acts through the GLP-1 receptor, connecting it with the body's natural GLP-1 signaling pathway.

GLP-1 signaling helps stimulate insulin release when blood glucose is elevated, influences glucagon secretion, slows movement of food from the stomach, and communicates with areas of the nervous system involved in hunger, fullness, satiety, and food intake. 

These interconnected effects explain why the GLP-1 pathway is studied in relation to blood-sugar regulation, appetite, eating behavior, metabolism, and body-weight regulation.

Research shows that GLP-1 has functions extending beyond blood-sugar regulation. It participates in communication between the gut, pancreas, nervous system, and brain, helping coordinate the body's response to food.

GLP-1 signaling has been associated with increased satiety, reduced hunger and food intake, regulation of insulin and glucagon, changes in gastric emptying, and body-weight regulation. These connections have made the GLP-1 pathway an important area of research in both metabolic health and weight management. 

The immune system protects the body by recognizing and responding to microorganisms, damaged cells, and other potential threats. It relies on communication between immune cells, tissues, chemical messengers, and protective barriers such as the skin and mucous membranes.

Healthy immune function requires the body to recognize a challenge, coordinate an appropriate response, communicate between different immune cells, and regulate that response as conditions change.

Thymosin Alpha-1 is a peptide on your Solex list that has been extensively studied in connection with immune regulation. 

Research has examined its interactions with several parts of the immune system, including T cells, dendritic cells, natural killer (NK) cells, and innate immune signaling.

Unlike the Inflammation section, where we're focusing on inflammatory signaling, this section focuses on how peptide signaling can influence communication and coordination within the immune system itself.

Research on Thymosin Alpha-1 has explored its ability to modulate innate and adaptive immune responses. Studies describe interactions with immune-cell maturation and activity, including dendritic cells, T cells, and natural killer cells.

This research helps demonstrate how peptides can participate in the complex communication networks the body uses to coordinate immune surveillance, defense, and regulation

Healthy aging begins at the cellular level. Cells need energy to function, systems to repair everyday damage, and mechanisms for responding to oxidative stress and cellular stress.

Mitochondria are especially important because they produce much of the energy cells need while also participating in cellular signaling and responses to stress. As cells age, changes can occur in mitochondrial function, cellular repair, oxidative balance, and cellular senescence—the process in which aging or damaged cells stop dividing but remain biologically active.

Several peptides are being researched for their connections with mitochondrial health, cellular protection, cellular stress responses, and biological aging.

MOTS-C is a naturally occurring mitochondrial-derived peptide involved in communication between mitochondria and the rest of the cell. Research has examined its connections with cellular metabolism, energy regulation, metabolic stress, and healthy aging.

SS-31 (Elamipretide) is a mitochondria-targeting peptide studied for its interactions with the inner mitochondrial membrane, mitochondrial energy production, and oxidative stress.

FOXO4-DRI is an experimental peptide studied in connection with cellular senescence. Researchers have investigated how it interacts with pathways that allow senescent cells to remain alive.

Epitalon is a synthetic peptide studied in aging research, including investigations involving cellular aging, telomeres, and telomerase activity. The evidence in this area remains experimental.

Peptide research is helping scientists investigate several different aspects of cellular aging rather than treating aging as one single biological process.

Research involving MOTS-C and SS-31 has focused heavily on mitochondrial signaling, energy metabolism, cellular stress, and mitochondrial function. FOXO4-DRI research has examined senescent cells and cellular survival pathways, while Epitalon has been investigated for potential relationships with telomere biology and cellular aging.

Much of this research remains preclinical or investigational, but it demonstrates how mitochondrial function, cellular stress, senescence, and cellular repair are interconnected areas of healthy-aging research.

Sleep is an active period of restoration. During sleep, the body coordinates nervous-system recovery, memory processing, hormone signaling, immune activity, tissue repair, and energy regulation. Deep sleep is also closely connected with normal nighttime growth hormone release, linking sleep with physical recovery.

DSIP (Delta Sleep-Inducing Peptide) — a nine-amino-acid peptide that has been researched for its relationship with sleep regulation, sleep stages, circadian activity, and neuroendocrine function. Human studies have investigated DSIP and sleep, although results across studies have been inconsistent. 

Epitalon —has been studied in aging and circadian-related research. Its proposed relationship with melatonin and circadian biology is an area of experimental research rather than an established sleep effect.

Growth-hormone signaling peptides — peptides such as CJC-1295, Sermorelin, Ipamorelin, and others in the GH pathway connect indirectly with sleep because normal growth-hormone secretion occurs in pulses and is strongly associated with deep sleep.

DSIP has been investigated in both animals and humans for decades. Early human studies reported changes in sleep duration, sleep onset, and sleep efficiency, while later research found some effects to be small or inconsistent. A scientific review concluded that DSIP's precise natural role and mechanism remain unresolved—making it an interesting example of a peptide whose biological story is still being investigated. 

Every cell in the body requires energy to function. The brain needs energy to think and process information, muscles need it for movement, and organs need it to perform their everyday functions. At the cellular level, mitochondria help convert nutrients into usable energy.

Energy production is closely connected with metabolism, blood-sugar regulation, insulin signaling, physical activity, stress, sleep, hormone activity, and recovery. These systems continually communicate and adjust according to the body's changing energy needs.

Peptides are part of the communication involved in regulating cellular energy, mitochondrial activity, glucose metabolism, insulin response, and metabolic adaptation.

One peptide researchers have studied extensively in this area is MOTS-C, a naturally occurring mitochondrial-derived peptide. MOTS-C has been investigated for its relationship with cellular energy regulation, glucose utilization, insulin sensitivity, metabolic stress, and communication between mitochondria and the rest of the cell.

This research has helped expand our understanding of mitochondria: they aren't simply structures that produce energy. They also participate in cellular signaling and metabolic communication.

Research on MOTS-C has examined its role as a mitochondrial signaling peptide and its relationship with metabolic regulation, cellular stress responses, glucose metabolism, and energy homeostasis. Research in this area continues to investigate how mitochondrial-derived peptides help coordinate communication between cellular energy status and whole-body metabolism.

The respiratory system brings oxygen into the body and removes carbon dioxide. The airways and lungs are also constantly exposed to microorganisms, particles, and other substances from the environment.

The lining of the respiratory tract provides an important first line of defense. Cells within the airways help recognize potential threats, communicate with immune cells, and produce substances that help protect the respiratory system.

LL-37 is a naturally occurring human host-defense peptide produced by respiratory epithelial cells and immune cells. Researchers have found LL-37 directly in the human airway surface, making it especially relevant to the body's natural respiratory defenses. 

LL-37 has been studied for its antimicrobial activity, airway immune signaling, inflammatory responses, and interactions with respiratory epithelial cells.

Human lung research has shown that LL-37 is produced by cells lining the conducting airways and airway glands and is secreted onto the airway surface. Researchers found that it demonstrated antimicrobial activity against several types of bacteria, supporting its role as part of the lung's innate immune defense system. 

Research also shows that LL-37 participates in communication between airway epithelial cells and the immune system, connecting respiratory defense with inflammatory and tissue-response pathways. 

The kidneys continuously filter the blood, remove waste, regulate fluid levels, and help maintain the body's balance of electrolytes. The urinary system also provides an important protective barrier against microorganisms that can enter through the urinary tract.

Healthy urinary function therefore depends on both kidney function and the body's natural defense mechanisms along the urinary tract.

LL-37 is a naturally occurring human host-defense peptide that is produced within the urinary tract. Researchers have studied its role in the body's innate defenses against bacteria that may enter the urinary system.

LL-37 is produced by urinary epithelial cells and can also be released by immune cells, connecting it with antimicrobial defense and urinary-tract protection.

Human research has identified LL-37 in the urinary tract and demonstrated that urinary epithelial cells can produce it. Researchers found that LL-37 contributes to the body's innate antimicrobial defense against urinary pathogens.

This research demonstrates that antimicrobial peptides are part of the urinary system's natural protective mechanisms and help provide a first line of defense against microorganisms.

The skin is the body's largest protective barrier and is constantly exposed to environmental stress, movement, friction, and normal cellular wear. Beneath the skin, connective tissues provide structure and support throughout the body.

Healthy tissue maintenance depends on processes involving collagen production, cellular communication, blood-vessel formation, and normal tissue repair.

GHK-Cu is a naturally occurring copper-binding peptide that has been studied extensively in connection with skin and connective-tissue biology.

Research has examined its influence on collagen and elastin production, fibroblast activity, blood-vessel formation, antioxidant activity, and tissue-remodeling processes.

Research involving GHK-Cu has demonstrated biological activity related to skin regeneration and tissue repair. Studies have examined its ability to influence genes and cellular pathways involved in collagen formation, extracellular-matrix remodeling, wound repair, and tissue maintenance.

These findings have made GHK-Cu an important peptide in research involving skin structure, connective tissue, and regenerative processes.

Muscles support movement, strength, balance, posture, and everyday physical activity. Muscle tissue is constantly adapting to physical activity and relies on normal processes of protein synthesis, cellular repair, blood flow, and recovery.

Recovery is also important because physical activity places temporary stress on muscle fibers. The body's ability to repair and maintain those tissues helps support continued strength, mobility, and physical function.

CJC-1295 is a synthetic peptide related to the body's natural growth hormone-releasing hormone (GHRH). It has been researched for its ability to signal the pituitary gland and influence the growth hormone and IGF-1 pathway.

Growth hormone and IGF-1 participate in biological processes involving muscle tissue, protein metabolism, body composition, and tissue maintenance.

Human clinical research has shown that CJC-1295 can produce sustained increases in growth hormone and IGF-1 concentrations. These hormones are part of the body's natural signaling system involved in growth, metabolism, muscle and tissue maintenance, and recovery.

Research into CJC-1295 helps demonstrate how peptide signaling can influence the body's growth hormone–IGF-1 pathway and the physiological processes connected with physical recovery.

Peptide signaling connects with male and female reproductive and sexual wellness, including reproductive hormone communication, fertility pathways, sexual desire, arousal, and reproductive function.

Kisspeptin-10 — Connects with GnRH signaling, which influences LH and FSH and the reproductive hormone pathways in both men and women.

Gonadorelin — A synthetic form of GnRH that signals the pituitary gland and influences the release of LH and FSH.

Triptorelin — A synthetic GnRH agonist that interacts with GnRH receptors and influences communication between the brain, pituitary gland, and reproductive system.

HMG (Human Menopausal Gonadotropin) — Provides FSH and LH activity, connecting with ovarian function and ovulation pathways in women and testicular and sperm-production pathways in men.

PT-141 (Bremelanotide) — Acts through melanocortin receptors in the nervous system and connects with sexual desire, arousal, and sexual-response pathways.

Oxytocin — A naturally occurring peptide hormone involved in bonding, social connection, sexual physiology, childbirth, and lactation.

Vision depends on the retina, optic nerve, and brain working together to receive light, convert it into electrical signals, and process those signals into what we see. Retinal cells have high energy demands and rely heavily on healthy mitochondrial function.

Because these cells require so much energy, researchers study how mitochondrial dysfunction, oxidative stress, and cellular damage may affect retinal and visual function. 

SS-31 (Elamipretide) is a mitochondria-targeting peptide studied in connection with retinal health and neuroprotection. Research has examined its relationship with mitochondrial function, oxidative stress, retinal ganglion cells, and retinal pigment epithelial cells. 

Retinal ganglion cells are particularly important because they transmit visual information from the retina toward the brain through the optic nerve.

Preclinical research has investigated SS-31 in retinal models and found associations with reduced oxidative damage, improved mitochondrial function, and protection of retinal structures and retinal ganglion cells. This research is largely experimental and does not establish SS-31 as a proven treatment for vision problems in humans. 

Hearing depends on delicate sensory hair cells within the inner ear, healthy auditory nerves, and the brain working together to detect and interpret sound. These sensory cells have significant energy demands and depend on healthy mitochondrial function to maintain the energy needed for normal cellular activity.

Unlike many other cells in the body, damaged auditory hair cells in humans do not readily regenerate. This is one reason researchers are interested in the processes that influence mitochondrial health, oxidative stress, cellular survival, and auditory nerve function. 

Peptide research involving hearing has explored the relationship between mitochondrial function and the protection of sensory hair cells in the inner ear.

SS-31 is a mitochondria-targeting peptide that has been investigated in auditory research. Researchers have studied its ability to target mitochondria within sensory hair cells and its relationship with mitochondrial membrane function and cellular protection during oxidative stress. 

A published study examined SS-31 in an experimental model of gentamicin-related auditory hair-cell damage. Researchers found that SS-31-modified nanoparticles accumulated in the mitochondria of sensory hair cells and were associated with improved mitochondrial function. The greatest hair-cell survival occurred when SS-31 was used as part of a mitochondrial-targeted delivery system carrying another compound, so the study does not establish that SS-31 alone prevents hearing loss. The research was also conducted in a zebrafish model, making this preclinical research rather than evidence of a proven effect in humans. 

Peripheral nerves form the communication network between the brain and spinal cord and the rest of the body. They carry sensory information such as touch, pain, temperature, and pressure, while also helping control movement and automatic functions within the body.

When peripheral nerves—particularly small nerve fibers—become damaged or dysfunctional, communication can be disrupted. This can contribute to sensations such as burning, tingling, numbness, altered sensitivity, and neuropathic pain.

Peptide research involving peripheral nerves includes pathways associated with nerve protection, inflammatory regulation, tissue repair, and nerve-fiber regeneration.

ARA-290 (Cibinetide) is a synthetic peptide derived from a portion of erythropoietin. It interacts with a receptor pathway known as the innate repair receptor, which researchers have studied for its role in tissue protection, inflammatory regulation, and cellular repair.

ARA-290 has been investigated specifically in human research involving small-fiber neuropathy and peripheral nerve function.

Human clinical research has examined ARA-290 in people with small-fiber neuropathy. Researchers evaluated neuropathic symptoms and changes in small nerve fibers and reported evidence consistent with small nerve-fiber regeneration, including increases in corneal nerve-fiber density.

The cornea was used as a location where researchers could measure small nerve fibers—the research was investigating neuropathy and nerve regeneration, not vision.

ARA-290 remains investigational, but this research provides an important example of how peptide signaling is being studied in connection with peripheral nerve protection, repair, and regeneration.

Healthy joints depend on the surrounding tendons, ligaments, muscles, cartilage, and connective tissues for movement, strength, and stability. Tendons connect muscle to bone, while ligaments connect bone to bone and help stabilize joints during movement.

These tissues regularly experience movement, tension, repetitive activity, and physical stress. Their ability to maintain and repair connective tissue is important for mobility, flexibility, stability, and everyday physical function.

Peptides are being researched for their connections with biological processes involved in connective-tissue maintenance, collagen formation, cellular migration, blood-vessel development, inflammatory signaling, and tissue repair.

BPC-157 has been studied primarily in preclinical research involving tendons, ligaments, muscles, and connective tissue. Researchers have investigated its relationship with fibroblast activity, collagen organization, blood-vessel formation, and tissue-repair processes.

TB-500, a synthetic peptide related to thymosin beta-4, has also been researched in connection with cell migration, blood-vessel formation, tissue remodeling, and repair processes important to muscles and connective tissues.

Research involving these peptides is primarily preclinical, meaning much of the evidence comes from laboratory and animal studies rather than established human clinical use.

A recent peer-reviewed review examined BPC-157 and TB-500 specifically, along with several other peptides, for musculoskeletal recovery. The researchers found promising but variable preclinical findings involving tendon, muscle, bone, and ligament healing, while emphasizing that human clinical evidence remains limited.

The digestive system does much more than break down food. The stomach and intestines help digest nutrients, absorb what the body needs, maintain the intestinal barrier, communicate with the nervous and immune systems, and protect the body from substances within the digestive tract.

The gastrointestinal lining is constantly exposed to food, digestive acids, microorganisms, medications, and other environmental factors. Maintaining the integrity of this tissue is an important part of normal digestion, nutrient absorption, immune function, and overall gastrointestinal health.

Peptides participate in many aspects of gastrointestinal communication, including digestive signaling, tissue maintenance, blood-vessel activity, inflammatory responses, and repair processes.

BPC-157 has been extensively investigated in experimental gastrointestinal research. Studies have examined its relationship with gastric and intestinal tissue integrity, mucosal protection, blood-vessel formation, tissue repair, and gastrointestinal healing pathways.

Its connection with the digestive system is particularly interesting because much of the early BPC-157 research focused specifically on the stomach and gastrointestinal tract.

Research involving BPC-157 has examined numerous experimental models involving the esophagus, stomach, small intestine, and lower gastrointestinal tract. Findings have generated interest in mechanisms involving mucosal integrity, angiogenesis, vascular function, and tissue-repair signaling.

However, much of the published evidence remains preclinical, particularly animal and laboratory research, so these findings do not establish clinical benefits in humans. 

Inflammation is part of the body's natural defense and repair response. When cells detect injury, infection, irritation, or tissue stress, they release chemical signals that help coordinate the body's response.

This process helps bring immune cells, signaling molecules, and repair mechanisms to the area where they are needed. But inflammatory signaling also has to be carefully regulated. The body needs to know when to activate inflammation, control its intensity, and eventually resolve the response so normal tissue function can continue.

LL-37 is a naturally occurring human peptide involved in both innate immune defense and inflammatory signaling.

Although LL-37 is well known for its antimicrobial activity, researchers have also found that it communicates with immune cells and interacts with several pathways that regulate inflammation.

Depending on the biological environment, LL-37 can influence the production of cytokines and chemokines, immune-cell recruitment, cellular signaling, and the balance of inflammatory responses. 

Research has demonstrated that LL-37 can modify inflammatory signaling rather than simply switching inflammation “on” or “off.”

For example, laboratory research using human immune cells found that LL-37 could regulate inflammatory responses triggered through Toll-like receptors (TLRs) and alter the release of inflammatory cytokines such as TNF-alpha. Researchers describe LL-37 as participating in the body's complex balancing of inflammatory responses. 

This makes LL-37 especially interesting in peptide research because it connects cellular communication, immune defense, and regulation of inflammation.